On the Origin of Species by Means of Natural Selection, Or, The Preservation of Favoured Races in the Struggle for LifeAppleton, 1898 |
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Página 211
... crustaceans , any such definition has hitherto been found impossible . There are crustaceans at the oppo- site ends of the series , which have hardly a character in common ; yet the species at both ends , from being plain- ly allied to ...
... crustaceans , any such definition has hitherto been found impossible . There are crustaceans at the oppo- site ends of the series , which have hardly a character in common ; yet the species at both ends , from being plain- ly allied to ...
Página 229
... Crustacea , for here the most wonderfully diverse forms are still linked together by a long and only partially broken chain of affinities . Extinction has only defined the groups : it has by no means made them ; for if every form which ...
... Crustacea , for here the most wonderfully diverse forms are still linked together by a long and only partially broken chain of affinities . Extinction has only defined the groups : it has by no means made them ; for if every form which ...
Página 234
... crustaceans , the general pattern seems thus to have become partially obscured . There is another and equally curious branch of our subject ; namely , serial homologies , or the comparison of the different parts or organs in the same ...
... crustaceans , the general pattern seems thus to have become partially obscured . There is another and equally curious branch of our subject ; namely , serial homologies , or the comparison of the different parts or organs in the same ...
Página 235
... crustaceans . It is familiar to almost every one , that in a flower the relative position of the sepals , petals , stamens , and pis- tils , as well as their intimate structure , are intelligible on the view that they consist of ...
... crustaceans . It is familiar to almost every one , that in a flower the relative position of the sepals , petals , stamens , and pis- tils , as well as their intimate structure , are intelligible on the view that they consist of ...
Página 243
... crustacean : but a glance at the larva shows this in an unmistakable manner . So again the two main divisions of ... crustaceans . To refer once again to cirripedes : the larvæ in the first stage have three pairs of locomotive organs ...
... crustacean : but a glance at the larva shows this in an unmistakable manner . So again the two main divisions of ... crustaceans . To refer once again to cirripedes : the larvæ in the first stage have three pairs of locomotive organs ...
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Términos y frases comunes
admit affinity allied species ancient animals appear Archipelago arctic areas become believe birds Cambrian changes characters cies classification climate closely allied common progenitor continent crustaceans degree deposited difficulty distant distinct species domestic doubt embryo eral Europe existing extinct fact faunas fertilised fertility flowers formations formerly forms fossil fresh-water Fritz Müller Gärtner genera genus geological period geological record Glacial period groups of species habits hybrids hybrids produced important individuals inhabitants inherited insects instance intermediate intervals land larvæ less living mammals manner marine Marsupials migration modified descendants mongrels mountains natural selection naturalists nearly occur oceanic islands offspring organisation parent parent-form peculiar perfect pistil plants pollen present probably produced quadrupeds reciprocal crosses regions remains remarked reproductive resemblance rocks rudimentary organs sediment seeds Silurian South America stage stamens sterility structure successive suppose terrestrial tertiary theory tion variations varieties whilst widely different wings